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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: FoundationKVTransaction.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.fdb;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.foundationdb.FDBException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.foundationdb.KeyValue;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.foundationdb.MutationType;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import com.foundationdb.Range;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import com.foundationdb.ReadTransaction;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import com.foundationdb.Transaction;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import com.foundationdb.async.AsyncIterator;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import com.google.common.base.Function;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import com.google.common.collect.Iterators;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.primitives.Bytes;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Iterator;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.jsimpledb.kv.KVPair;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.jsimpledb.kv.KVTransaction;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.jsimpledb.kv.KVTransactionException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.jsimpledb.kv.RetryTransactionException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.jsimpledb.kv.StaleTransactionException;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.jsimpledb.kv.TransactionTimeoutException;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.jsimpledb.util.ByteReader;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.jsimpledb.util.ByteUtil;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.jsimpledb.util.ByteWriter;<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>/**<a name="line.33"></a>
<span class="sourceLineNo">034</span> * FoundationDB transaction.<a name="line.34"></a>
<span class="sourceLineNo">035</span> */<a name="line.35"></a>
<span class="sourceLineNo">036</span>public class FoundationKVTransaction implements KVTransaction {<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    private static final byte[] MIN_KEY = ByteUtil.EMPTY;                   // minimum possible key (inclusive)<a name="line.38"></a>
<span class="sourceLineNo">039</span>    private static final byte[] MAX_KEY = new byte[] { (byte)0xff };        // maximum possible key (exclusive)<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>    private final FoundationKVDatabase store;<a name="line.41"></a>
<span class="sourceLineNo">042</span>    private final Transaction tx;<a name="line.42"></a>
<span class="sourceLineNo">043</span>    private final byte[] keyPrefix;<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>    private volatile boolean stale;<a name="line.45"></a>
<span class="sourceLineNo">046</span>    private volatile boolean canceled;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>    /**<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * Constructor.<a name="line.49"></a>
<span class="sourceLineNo">050</span>     */<a name="line.50"></a>
<span class="sourceLineNo">051</span>    FoundationKVTransaction(FoundationKVDatabase store, byte[] keyPrefix) {<a name="line.51"></a>
<span class="sourceLineNo">052</span>        if (store == null)<a name="line.52"></a>
<span class="sourceLineNo">053</span>            throw new IllegalArgumentException("null store");<a name="line.53"></a>
<span class="sourceLineNo">054</span>        this.store = store;<a name="line.54"></a>
<span class="sourceLineNo">055</span>        this.tx = this.store.getDatabase().createTransaction();<a name="line.55"></a>
<span class="sourceLineNo">056</span>        this.keyPrefix = keyPrefix;<a name="line.56"></a>
<span class="sourceLineNo">057</span>    }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>// KVTransaction<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>    @Override<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public FoundationKVDatabase getKVDatabase() {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        return this.store;<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * Get the underlying {@link Transaction} associated with this instance.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     *<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * @return the associated transaction<a name="line.69"></a>
<span class="sourceLineNo">070</span>     */<a name="line.70"></a>
<span class="sourceLineNo">071</span>    public Transaction getTransaction() {<a name="line.71"></a>
<span class="sourceLineNo">072</span>        return this.tx;<a name="line.72"></a>
<span class="sourceLineNo">073</span>    }<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>    @Override<a name="line.75"></a>
<span class="sourceLineNo">076</span>    public void setTimeout(long timeout) {<a name="line.76"></a>
<span class="sourceLineNo">077</span>        if (timeout &lt; 0)<a name="line.77"></a>
<span class="sourceLineNo">078</span>            throw new IllegalArgumentException("timeout &lt; 0");<a name="line.78"></a>
<span class="sourceLineNo">079</span>        this.tx.options().setTimeout(timeout);<a name="line.79"></a>
<span class="sourceLineNo">080</span>    }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span>    @Override<a name="line.82"></a>
<span class="sourceLineNo">083</span>    public byte[] get(byte[] key) {<a name="line.83"></a>
<span class="sourceLineNo">084</span>        if (this.stale)<a name="line.84"></a>
<span class="sourceLineNo">085</span>            throw new StaleTransactionException(this);<a name="line.85"></a>
<span class="sourceLineNo">086</span>        if (key.length &gt; 0 &amp;&amp; key[0] == (byte)0xff)<a name="line.86"></a>
<span class="sourceLineNo">087</span>            throw new IllegalArgumentException("key starts with 0xff");<a name="line.87"></a>
<span class="sourceLineNo">088</span>        try {<a name="line.88"></a>
<span class="sourceLineNo">089</span>            return this.tx.get(this.addPrefix(key)).get();<a name="line.89"></a>
<span class="sourceLineNo">090</span>        } catch (FDBException e) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>            throw this.wrapException(e);<a name="line.91"></a>
<span class="sourceLineNo">092</span>        }<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    @Override<a name="line.95"></a>
<span class="sourceLineNo">096</span>    public KVPair getAtLeast(byte[] minKey) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        if (this.stale)<a name="line.97"></a>
<span class="sourceLineNo">098</span>            throw new StaleTransactionException(this);<a name="line.98"></a>
<span class="sourceLineNo">099</span>        if (minKey != null &amp;&amp; minKey.length &gt; 0 &amp;&amp; minKey[0] == (byte)0xff)<a name="line.99"></a>
<span class="sourceLineNo">100</span>            return null;<a name="line.100"></a>
<span class="sourceLineNo">101</span>        return this.getFirstInRange(minKey, null, false);<a name="line.101"></a>
<span class="sourceLineNo">102</span>    }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>    @Override<a name="line.104"></a>
<span class="sourceLineNo">105</span>    public KVPair getAtMost(byte[] maxKey) {<a name="line.105"></a>
<span class="sourceLineNo">106</span>        if (this.stale)<a name="line.106"></a>
<span class="sourceLineNo">107</span>            throw new StaleTransactionException(this);<a name="line.107"></a>
<span class="sourceLineNo">108</span>        if (maxKey != null &amp;&amp; maxKey.length &gt; 0 &amp;&amp; maxKey[0] == (byte)0xff)<a name="line.108"></a>
<span class="sourceLineNo">109</span>            maxKey = null;<a name="line.109"></a>
<span class="sourceLineNo">110</span>        return this.getFirstInRange(null, maxKey, true);<a name="line.110"></a>
<span class="sourceLineNo">111</span>    }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span>    @Override<a name="line.113"></a>
<span class="sourceLineNo">114</span>    public Iterator&lt;KVPair&gt; getRange(byte[] minKey, byte[] maxKey, boolean reverse) {<a name="line.114"></a>
<span class="sourceLineNo">115</span>        if (this.stale)<a name="line.115"></a>
<span class="sourceLineNo">116</span>            throw new StaleTransactionException(this);<a name="line.116"></a>
<span class="sourceLineNo">117</span>        if (minKey != null &amp;&amp; minKey.length &gt; 0 &amp;&amp; minKey[0] == (byte)0xff)<a name="line.117"></a>
<span class="sourceLineNo">118</span>            minKey = MAX_KEY;<a name="line.118"></a>
<span class="sourceLineNo">119</span>        if (maxKey != null &amp;&amp; maxKey.length &gt; 0 &amp;&amp; maxKey[0] == (byte)0xff)<a name="line.119"></a>
<span class="sourceLineNo">120</span>            maxKey = null;<a name="line.120"></a>
<span class="sourceLineNo">121</span>        if (minKey != null &amp;&amp; maxKey != null &amp;&amp; ByteUtil.compare(minKey, maxKey) &gt; 0)<a name="line.121"></a>
<span class="sourceLineNo">122</span>            throw new IllegalArgumentException("minKey &gt; maxKey");<a name="line.122"></a>
<span class="sourceLineNo">123</span>        try {<a name="line.123"></a>
<span class="sourceLineNo">124</span>            return Iterators.transform(this.tx.getRange(this.addPrefix(minKey, maxKey),<a name="line.124"></a>
<span class="sourceLineNo">125</span>              ReadTransaction.ROW_LIMIT_UNLIMITED, reverse).iterator(), new Function&lt;KeyValue, KVPair&gt;() {<a name="line.125"></a>
<span class="sourceLineNo">126</span>                @Override<a name="line.126"></a>
<span class="sourceLineNo">127</span>                public KVPair apply(KeyValue kv) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>                    return new KVPair(FoundationKVTransaction.this.removePrefix(kv.getKey()), kv.getValue());<a name="line.128"></a>
<span class="sourceLineNo">129</span>                }<a name="line.129"></a>
<span class="sourceLineNo">130</span>            });<a name="line.130"></a>
<span class="sourceLineNo">131</span>        } catch (FDBException e) {<a name="line.131"></a>
<span class="sourceLineNo">132</span>            throw this.wrapException(e);<a name="line.132"></a>
<span class="sourceLineNo">133</span>        }<a name="line.133"></a>
<span class="sourceLineNo">134</span>    }<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>    private KVPair getFirstInRange(byte[] minKey, byte[] maxKey, boolean reverse) {<a name="line.136"></a>
<span class="sourceLineNo">137</span>        try {<a name="line.137"></a>
<span class="sourceLineNo">138</span>            final AsyncIterator&lt;KeyValue&gt; i = this.tx.getRange(this.addPrefix(minKey, maxKey),<a name="line.138"></a>
<span class="sourceLineNo">139</span>              ReadTransaction.ROW_LIMIT_UNLIMITED, reverse).iterator();<a name="line.139"></a>
<span class="sourceLineNo">140</span>            if (!i.hasNext())<a name="line.140"></a>
<span class="sourceLineNo">141</span>                return null;<a name="line.141"></a>
<span class="sourceLineNo">142</span>            final KeyValue kv = i.next();<a name="line.142"></a>
<span class="sourceLineNo">143</span>            return new KVPair(this.removePrefix(kv.getKey()), kv.getValue());<a name="line.143"></a>
<span class="sourceLineNo">144</span>        } catch (FDBException e) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>            throw this.wrapException(e);<a name="line.145"></a>
<span class="sourceLineNo">146</span>        }<a name="line.146"></a>
<span class="sourceLineNo">147</span>    }<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>    @Override<a name="line.149"></a>
<span class="sourceLineNo">150</span>    public void put(byte[] key, byte[] value) {<a name="line.150"></a>
<span class="sourceLineNo">151</span>        if (this.stale)<a name="line.151"></a>
<span class="sourceLineNo">152</span>            throw new StaleTransactionException(this);<a name="line.152"></a>
<span class="sourceLineNo">153</span>        if (key.length &gt; 0 &amp;&amp; key[0] == (byte)0xff)<a name="line.153"></a>
<span class="sourceLineNo">154</span>            throw new IllegalArgumentException("key starts with 0xff");<a name="line.154"></a>
<span class="sourceLineNo">155</span>        try {<a name="line.155"></a>
<span class="sourceLineNo">156</span>            this.tx.set(this.addPrefix(key), value);<a name="line.156"></a>
<span class="sourceLineNo">157</span>        } catch (FDBException e) {<a name="line.157"></a>
<span class="sourceLineNo">158</span>            throw this.wrapException(e);<a name="line.158"></a>
<span class="sourceLineNo">159</span>        }<a name="line.159"></a>
<span class="sourceLineNo">160</span>    }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>    @Override<a name="line.162"></a>
<span class="sourceLineNo">163</span>    public void remove(byte[] key) {<a name="line.163"></a>
<span class="sourceLineNo">164</span>        if (this.stale)<a name="line.164"></a>
<span class="sourceLineNo">165</span>            throw new StaleTransactionException(this);<a name="line.165"></a>
<span class="sourceLineNo">166</span>        if (key.length &gt; 0 &amp;&amp; key[0] == (byte)0xff)<a name="line.166"></a>
<span class="sourceLineNo">167</span>            throw new IllegalArgumentException("key starts with 0xff");<a name="line.167"></a>
<span class="sourceLineNo">168</span>        try {<a name="line.168"></a>
<span class="sourceLineNo">169</span>            this.tx.clear(this.addPrefix(key));<a name="line.169"></a>
<span class="sourceLineNo">170</span>        } catch (FDBException e) {<a name="line.170"></a>
<span class="sourceLineNo">171</span>            throw this.wrapException(e);<a name="line.171"></a>
<span class="sourceLineNo">172</span>        }<a name="line.172"></a>
<span class="sourceLineNo">173</span>    }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>    @Override<a name="line.175"></a>
<span class="sourceLineNo">176</span>    public void removeRange(byte[] minKey, byte[] maxKey) {<a name="line.176"></a>
<span class="sourceLineNo">177</span>        if (this.stale)<a name="line.177"></a>
<span class="sourceLineNo">178</span>            throw new StaleTransactionException(this);<a name="line.178"></a>
<span class="sourceLineNo">179</span>        if (minKey != null &amp;&amp; minKey.length &gt; 0 &amp;&amp; minKey[0] == (byte)0xff)<a name="line.179"></a>
<span class="sourceLineNo">180</span>            return;<a name="line.180"></a>
<span class="sourceLineNo">181</span>        if (maxKey != null &amp;&amp; maxKey.length &gt; 0 &amp;&amp; maxKey[0] == (byte)0xff)<a name="line.181"></a>
<span class="sourceLineNo">182</span>            maxKey = null;<a name="line.182"></a>
<span class="sourceLineNo">183</span>        if (minKey != null &amp;&amp; maxKey != null &amp;&amp; ByteUtil.compare(minKey, maxKey) &gt; 0)<a name="line.183"></a>
<span class="sourceLineNo">184</span>            throw new IllegalArgumentException("minKey &gt; maxKey");<a name="line.184"></a>
<span class="sourceLineNo">185</span>        try {<a name="line.185"></a>
<span class="sourceLineNo">186</span>            this.tx.clear(this.addPrefix(minKey, maxKey));<a name="line.186"></a>
<span class="sourceLineNo">187</span>        } catch (FDBException e) {<a name="line.187"></a>
<span class="sourceLineNo">188</span>            throw this.wrapException(e);<a name="line.188"></a>
<span class="sourceLineNo">189</span>        }<a name="line.189"></a>
<span class="sourceLineNo">190</span>    }<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span>    @Override<a name="line.192"></a>
<span class="sourceLineNo">193</span>    public void commit() {<a name="line.193"></a>
<span class="sourceLineNo">194</span>        if (this.stale)<a name="line.194"></a>
<span class="sourceLineNo">195</span>            throw new StaleTransactionException(this);<a name="line.195"></a>
<span class="sourceLineNo">196</span>        this.stale = true;<a name="line.196"></a>
<span class="sourceLineNo">197</span>        try {<a name="line.197"></a>
<span class="sourceLineNo">198</span>            this.tx.commit().get();<a name="line.198"></a>
<span class="sourceLineNo">199</span>        } catch (FDBException e) {<a name="line.199"></a>
<span class="sourceLineNo">200</span>            throw this.wrapException(e);<a name="line.200"></a>
<span class="sourceLineNo">201</span>        } finally {<a name="line.201"></a>
<span class="sourceLineNo">202</span>            this.cancel();<a name="line.202"></a>
<span class="sourceLineNo">203</span>        }<a name="line.203"></a>
<span class="sourceLineNo">204</span>    }<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>    @Override<a name="line.206"></a>
<span class="sourceLineNo">207</span>    public void rollback() {<a name="line.207"></a>
<span class="sourceLineNo">208</span>        if (this.stale)<a name="line.208"></a>
<span class="sourceLineNo">209</span>            return;<a name="line.209"></a>
<span class="sourceLineNo">210</span>        this.stale = true;<a name="line.210"></a>
<span class="sourceLineNo">211</span>        this.cancel();<a name="line.211"></a>
<span class="sourceLineNo">212</span>    }<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span>    private void cancel() {<a name="line.214"></a>
<span class="sourceLineNo">215</span>        if (this.canceled)<a name="line.215"></a>
<span class="sourceLineNo">216</span>            return;<a name="line.216"></a>
<span class="sourceLineNo">217</span>        this.canceled = true;<a name="line.217"></a>
<span class="sourceLineNo">218</span>        try {<a name="line.218"></a>
<span class="sourceLineNo">219</span>            this.tx.cancel();<a name="line.219"></a>
<span class="sourceLineNo">220</span>        } catch (FDBException e) {<a name="line.220"></a>
<span class="sourceLineNo">221</span>            // ignore<a name="line.221"></a>
<span class="sourceLineNo">222</span>        }<a name="line.222"></a>
<span class="sourceLineNo">223</span>    }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>    @Override<a name="line.225"></a>
<span class="sourceLineNo">226</span>    public byte[] encodeCounter(long value) {<a name="line.226"></a>
<span class="sourceLineNo">227</span>        final ByteWriter writer = new ByteWriter(8);<a name="line.227"></a>
<span class="sourceLineNo">228</span>        ByteUtil.writeLong(writer, value);<a name="line.228"></a>
<span class="sourceLineNo">229</span>        final byte[] bytes = writer.getBytes();<a name="line.229"></a>
<span class="sourceLineNo">230</span>        this.reverse(bytes);<a name="line.230"></a>
<span class="sourceLineNo">231</span>        return bytes;<a name="line.231"></a>
<span class="sourceLineNo">232</span>    }<a name="line.232"></a>
<span class="sourceLineNo">233</span><a name="line.233"></a>
<span class="sourceLineNo">234</span>    @Override<a name="line.234"></a>
<span class="sourceLineNo">235</span>    public long decodeCounter(byte[] bytes) {<a name="line.235"></a>
<span class="sourceLineNo">236</span>        if (this.stale)<a name="line.236"></a>
<span class="sourceLineNo">237</span>            throw new StaleTransactionException(this);<a name="line.237"></a>
<span class="sourceLineNo">238</span>        if (bytes.length != 8)<a name="line.238"></a>
<span class="sourceLineNo">239</span>            throw new IllegalArgumentException("invalid encoded counter value: length = " + bytes.length + " != 8");<a name="line.239"></a>
<span class="sourceLineNo">240</span>        bytes = bytes.clone();<a name="line.240"></a>
<span class="sourceLineNo">241</span>        this.reverse(bytes);<a name="line.241"></a>
<span class="sourceLineNo">242</span>        return ByteUtil.readLong(new ByteReader(bytes));<a name="line.242"></a>
<span class="sourceLineNo">243</span>    }<a name="line.243"></a>
<span class="sourceLineNo">244</span><a name="line.244"></a>
<span class="sourceLineNo">245</span>    @Override<a name="line.245"></a>
<span class="sourceLineNo">246</span>    public void adjustCounter(byte[] key, long amount) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>        if (this.stale)<a name="line.247"></a>
<span class="sourceLineNo">248</span>            throw new StaleTransactionException(this);<a name="line.248"></a>
<span class="sourceLineNo">249</span>        this.tx.mutate(MutationType.ADD, this.addPrefix(key), this.encodeCounter(amount));<a name="line.249"></a>
<span class="sourceLineNo">250</span>    }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span>    private void reverse(byte[] bytes) {<a name="line.252"></a>
<span class="sourceLineNo">253</span>        int i = 0;<a name="line.253"></a>
<span class="sourceLineNo">254</span>        int j = bytes.length - 1;<a name="line.254"></a>
<span class="sourceLineNo">255</span>        while (i &lt; j) {<a name="line.255"></a>
<span class="sourceLineNo">256</span>            final byte temp = bytes[i];<a name="line.256"></a>
<span class="sourceLineNo">257</span>            bytes[i] = bytes[j];<a name="line.257"></a>
<span class="sourceLineNo">258</span>            bytes[j] = temp;<a name="line.258"></a>
<span class="sourceLineNo">259</span>            i++;<a name="line.259"></a>
<span class="sourceLineNo">260</span>            j--;<a name="line.260"></a>
<span class="sourceLineNo">261</span>        }<a name="line.261"></a>
<span class="sourceLineNo">262</span>    }<a name="line.262"></a>
<span class="sourceLineNo">263</span><a name="line.263"></a>
<span class="sourceLineNo">264</span>// Other methods<a name="line.264"></a>
<span class="sourceLineNo">265</span><a name="line.265"></a>
<span class="sourceLineNo">266</span>    /**<a name="line.266"></a>
<span class="sourceLineNo">267</span>     * Wrap the given {@link FDBException} in the appropriate {@link KVTransactionException}.<a name="line.267"></a>
<span class="sourceLineNo">268</span>     *<a name="line.268"></a>
<span class="sourceLineNo">269</span>     * @param e FoundationDB exception<a name="line.269"></a>
<span class="sourceLineNo">270</span>     * @return appropriate {@link KVTransactionException} with chained exception {@code e}<a name="line.270"></a>
<span class="sourceLineNo">271</span>     * @throws NullPointerException if {@code e} is null<a name="line.271"></a>
<span class="sourceLineNo">272</span>     */<a name="line.272"></a>
<span class="sourceLineNo">273</span>    public KVTransactionException wrapException(FDBException e) {<a name="line.273"></a>
<span class="sourceLineNo">274</span>        try {<a name="line.274"></a>
<span class="sourceLineNo">275</span>            this.cancel();<a name="line.275"></a>
<span class="sourceLineNo">276</span>        } catch (KVTransactionException e2) {<a name="line.276"></a>
<span class="sourceLineNo">277</span>            // ignore<a name="line.277"></a>
<span class="sourceLineNo">278</span>        }<a name="line.278"></a>
<span class="sourceLineNo">279</span>        switch (e.getCode()) {<a name="line.279"></a>
<span class="sourceLineNo">280</span>        case ErrorCodes.TRANSACTION_TIMED_OUT:<a name="line.280"></a>
<span class="sourceLineNo">281</span>        case ErrorCodes.PAST_VERSION:<a name="line.281"></a>
<span class="sourceLineNo">282</span>            return new TransactionTimeoutException(this, e);<a name="line.282"></a>
<span class="sourceLineNo">283</span>        case ErrorCodes.NOT_COMMITTED:<a name="line.283"></a>
<span class="sourceLineNo">284</span>        case ErrorCodes.COMMIT_UNKNOWN_RESULT:<a name="line.284"></a>
<span class="sourceLineNo">285</span>            return new RetryTransactionException(this, e);<a name="line.285"></a>
<span class="sourceLineNo">286</span>        default:<a name="line.286"></a>
<span class="sourceLineNo">287</span>            return new KVTransactionException(this, e);<a name="line.287"></a>
<span class="sourceLineNo">288</span>        }<a name="line.288"></a>
<span class="sourceLineNo">289</span>    }<a name="line.289"></a>
<span class="sourceLineNo">290</span><a name="line.290"></a>
<span class="sourceLineNo">291</span>// Key prefixing<a name="line.291"></a>
<span class="sourceLineNo">292</span><a name="line.292"></a>
<span class="sourceLineNo">293</span>    private byte[] addPrefix(byte[] key) {<a name="line.293"></a>
<span class="sourceLineNo">294</span>        return this.keyPrefix != null ? Bytes.concat(this.keyPrefix, key) : key;<a name="line.294"></a>
<span class="sourceLineNo">295</span>    }<a name="line.295"></a>
<span class="sourceLineNo">296</span><a name="line.296"></a>
<span class="sourceLineNo">297</span>    private Range addPrefix(byte[] minKey, byte[] maxKey) {<a name="line.297"></a>
<span class="sourceLineNo">298</span>        return new Range(this.addPrefix(minKey != null ? minKey : MIN_KEY), this.addPrefix(maxKey != null ? maxKey : MAX_KEY));<a name="line.298"></a>
<span class="sourceLineNo">299</span>    }<a name="line.299"></a>
<span class="sourceLineNo">300</span><a name="line.300"></a>
<span class="sourceLineNo">301</span>    private byte[] removePrefix(byte[] key) {<a name="line.301"></a>
<span class="sourceLineNo">302</span>        if (this.keyPrefix == null)<a name="line.302"></a>
<span class="sourceLineNo">303</span>            return key;<a name="line.303"></a>
<span class="sourceLineNo">304</span>        if (!ByteUtil.isPrefixOf(this.keyPrefix, key)) {<a name="line.304"></a>
<span class="sourceLineNo">305</span>            throw new IllegalArgumentException("read key " + ByteUtil.toString(key) + " not having "<a name="line.305"></a>
<span class="sourceLineNo">306</span>              + ByteUtil.toString(this.keyPrefix) + " as a prefix");<a name="line.306"></a>
<span class="sourceLineNo">307</span>        }<a name="line.307"></a>
<span class="sourceLineNo">308</span>        final byte[] stripped = new byte[key.length - this.keyPrefix.length];<a name="line.308"></a>
<span class="sourceLineNo">309</span>        System.arraycopy(key, this.keyPrefix.length, stripped, 0, stripped.length);<a name="line.309"></a>
<span class="sourceLineNo">310</span>        return stripped;<a name="line.310"></a>
<span class="sourceLineNo">311</span>    }<a name="line.311"></a>
<span class="sourceLineNo">312</span>}<a name="line.312"></a>
<span class="sourceLineNo">313</span><a name="line.313"></a>




























































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